I bought two sets of Deco W7200 mesh routers, installed easily on google fiber internet.  The system worked flawlessly for 1 day, then abruptly would not allow any devices to connect even though in the app I could see the system was up and running fine.  I ended up resetting all to factory settings, installing from new again, used a new wifi password and starting setting up all devices again.  Shortly into the process the system again kicked everything off and would not allow connections.  I've determined that whenever the 5 GHz is enabled, this happens.  If I turn off the 5 GHz, everything connects fine and runs fine.  I have tried denying every device to see if one of the connecting devices is the issue, but even with all devices denied, the problem exists.  I need some help from here.  I have updated the firmware to the most recent.  Not sure what's next???